The primer must be in the LOCKED position for flight to prevent over rich mixtures.

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Multiple Choice

The primer must be in the LOCKED position for flight to prevent over rich mixtures.

Explanation:
Primers are used to enrich the fuel mixture for starting, and during flight you want to prevent any accidental priming. Keeping the primer in the locked position blocks the priming mechanism so it can’t be actuated by a bump or by accidental movement, which could otherwise introduce extra fuel and make the mixture too rich. A rich mixture in flight can cause rough running, fouled plugs, and reduced engine performance, so locking the primer helps maintain safe, stable operation. The other positions would either allow unintended priming (unlocked or mid) or are not the appropriate state to protect against accidental fuel induction during flight.

Primers are used to enrich the fuel mixture for starting, and during flight you want to prevent any accidental priming. Keeping the primer in the locked position blocks the priming mechanism so it can’t be actuated by a bump or by accidental movement, which could otherwise introduce extra fuel and make the mixture too rich. A rich mixture in flight can cause rough running, fouled plugs, and reduced engine performance, so locking the primer helps maintain safe, stable operation. The other positions would either allow unintended priming (unlocked or mid) or are not the appropriate state to protect against accidental fuel induction during flight.

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